[CS09]Remove hidden API usage of NetworkRequest

The connection service will become the mainline module.
So, need to remove the hidden API usage of NetworkRequest.
The NetworkRequest.type(TRACK_DEFAULT) is no longer sent
to the factories. So, remove the (TRACK_DEFAULT) check to
avoid using hidden API.

Bug: 170598012
Test: atest EthernetServiceTests
Change-Id: I5b5fed864318e9ac7e190c40d4f52076ab0eece8

service-t/src/com/android/server/ethernet/EthernetNetworkFactory.java

@@ -88,10 +88,6 @@ public class EthernetNetworkFactory extends NetworkFactory {
 
     @Override
     public boolean acceptRequest(NetworkRequest request) {
-        if (request.type == NetworkRequest.Type.TRACK_DEFAULT) {
-            return false;
-        }
-
         if (DBG) {
             Log.d(TAG, "acceptRequest, request: " + request);
         }